Computer Chess, (Atari Chess, CXL-4009)
a cartridge chess program for Atari 8-bit home computers by Larry Wagner (Game AI, with the help of Julio Kaplan[1]) and Bob Whitehead, initially the development version or prototype of Video Chess, released for the Atari 2600 in 1978 [2]. In 1979 a revised version of the program was released by Atari as Computer Chess, adapted for the Atari 400/800. A joystick was used to move the pieces.